BAGHDAD - Four of the most senior political leaders in Iraq's fragile coalition have threatened to bring a vote of no confidence in the government unless "autocratic decision-making" stops, a letter published in a state newspaper on Saturday said.

Iraq's Shi'ite, Sunni and Kurd coalition began to creak in December, after US troops left, when the government tried to remove Sunni Deputy Prime Minister Saleh al-Mutlaq and issued an arrest warrant for Sunni Vice President Tareq al-Hashemi.

Those incidents intensified long-running tensions between the Sunni and Shi'ite blocs that have hampered the government's ability to pass key legislation.

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